JPH11218135A - Cage for cylindrical roller bearing - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an integral type cylindrical roller bearing cage that can ensure uniform lubrication of a roller without damaging the roller at the time of pressing in. SOLUTION: Guide faces of a cylindrical roller 4 are formed of circular arc faces 6. Each circular arc face 6 is connected to the inner peripheral surface 8 of a cage through a plane part 7. Two plane parts 7 opposed in each pocket 3 are formed to be parallel to each other, and a space between them is formed to be slightly smaller than the diameter of the cylindrical roller 4. The cylindrical roller 4 pressed into the pocket 3 of the cage is therefore pressed uniformly to each plane part 7, and the plane part 7 and the outer peripheral surface of the cylindrical roller enclosed in the cage form a uniform wedge shape in the axial direction of the cylindrical roller 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylindrical roller bearing retainer having a roller guide surface.

[0002]

2. Description of the Related Art A cage used for a bearing of a main motor or the like has a concave guide surface in a pocket for accommodating the roller in order to properly guide and lubricate the roller. Often used. As this type of cage, one side ring is formed separately, the rollers are inserted from the axial direction of the cage, and then the side ring is tightened with rivets, etc., and the cage is integrated. There is a type in which rollers are pressed into pockets from a radial direction.

In the former, there is a problem in that it takes time and effort to tighten the separate side ring, and the tightened portion is easily loosened during use.

The latter is devised in order to solve the above-mentioned problem, and for example, there is one disclosed in Japanese Patent Application Laid-Open No. Hei 5-202941. This retainer is shown in FIG.
As shown in (a) and (b), it is composed of two concentric side rings 15 and a plurality of webs 16 connecting these side rings 15, and has an axially continuous concave shape on the side surface of each web 16. Guide surfaces 17 are formed, and rollers 18 are accommodated between adjacent webs 16.

[0005] On the inner peripheral surface of the web 16, two holding projections 19 are provided apart from the side rings 15, and by utilizing the elastic deformation of the holding projections 19, the rollers 18 are arranged from the inner peripheral side. It is designed to be press-fitted. On the outer peripheral surface side of the web 16, holding projections 20 for preventing the rollers 18 from falling off are provided at both ends in the axial direction. The inner surface of each of the holding projections 19 and 20 forms a part of the concave guide surface 17.

[0006] The above-mentioned integrated cage has a problem that the surface of the roller 18 is easily damaged because only the portion of the holding projection 19 is pressed against the roller 18 which is press-fitted from the inner peripheral side. Further, in the portion of the holding projection 19, the lubricant is swept to both sides, so that the lubrication on the guide surface 17 is performed by the rollers 18
There is also a problem of non-uniformity in the axial direction.

It is an object of the present invention to provide an integrated cylindrical roller bearing retainer that can ensure uniform lubrication of the rollers without damaging the rollers during press-fitting.

[0008]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a plurality of concentric ring portions and a plurality of concentric ring portions which are connected at equal intervals in a circumferential direction. In a cylindrical roller bearing retainer comprising a column portion and accommodating a cylindrical roller between each adjacent column portion, an arc surface for guiding the cylindrical roller is formed on a side surface of each column portion, and each of these arc surfaces is formed. At least one of the retainer radial directions is connected to the outer peripheral surface or the inner peripheral surface of the pillar portion by a flat portion, and the flat portions on the side surfaces of the pillar portions facing each other are parallel to each other, and are spaced from each other. Is formed slightly smaller than the diameter of the cylindrical roller.

That is, by connecting flat portions which are parallel to each other and whose interval is slightly smaller than the diameter of the cylindrical roller on the side where the cylindrical roller is pressed into the opposed arcuate surface, the cylindrical roller is connected to the flat portion. The outer peripheral surface was pressed evenly so that the surface of the cylindrical roller was not damaged.

After the cylindrical roller bearing is mounted on the shaft, the cylindrical roller is constrained in the radial direction by the outer ring and the inner ring. Therefore, the cylindrical roller does not have to fall off when the bearing is handled. Therefore, the difference between the diameter of the cylindrical roller and the interval between the opposing flat portions may be small enough to insert the cylindrical roller by elastic deformation of the pillar portion.

Further, after the cylindrical roller is pressed into the retainer, the flat portion and the outer peripheral surface of the cylindrical roller form a uniform wedge shape in the axial direction of the cylindrical roller. The lubricant is uniformly and satisfactorily guided between the arc surface and the outer peripheral surface of the cylindrical roller.

If a chamfer is provided at the boundary between each of the flat portions and the outer peripheral surface or the inner peripheral surface of the column portion, the cylindrical roller can be more smoothly pressed into the retainer.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 1 and 2 show a first embodiment. FIG. 1 is an overall view of a cage for a cylindrical roller bearing, and FIG. 2 is an enlarged view of a main part thereof.

This cage is formed by cutting brass material, and as shown in FIGS. 1 (a) and 1 (b),
A cylindrical roller 4 is accommodated in a pocket 3 formed between two concentric ring portions 1 and a plurality of column portions 2 connecting the ring portions 1 to each other. The curved surface 5 at each corner of the pocket 3 is a steal at the time of cutting.

A concave arcuate surface 6 serving as a guide surface of the cylindrical roller 4 is formed on the side surface of each of the pillars 2. Connected to face 8. The outer peripheral side of the retainer of the arc surface 6 is directly connected to the outer peripheral surface 9 so that the cylindrical roller 4 does not fall off.

Each flat portion 7 formed on the opposite side surface
Are parallel to each other, and the interval between them is slightly smaller than the diameter of the cylindrical roller 4. As shown in FIG. 2B, the flat portion 7 is connected to the inner peripheral surface 8 of the cage at a uniform height along the axial direction of the cylindrical roller 4, so that the cylindrical roller 4 is At each position, it is inserted into the pocket 3 while being evenly pressed by the flat portion 7.

As shown in FIG. 2 (b), the outer peripheral surfaces of the flat portion 7 and the cylindrical roller 4 housed in the retainer are formed in a wedge shape, and serve as a guide surface of the cylindrical roller 4. The lubricant is guided to the arc surface 6 well.

FIG. 3 is an enlarged view of a main part of the second embodiment. This cage has the same basic configuration as that of the first embodiment. An arc-shaped chamfer is formed at a boundary between a plane portion 12 connected to an arc surface 11 of a pillar 10 and an inner peripheral surface 13 of the cage. 1
4 is provided.

In each of the above-described embodiments, the flat portion into which the cylindrical rollers are press-fitted is provided on the inner peripheral side of the retainer. However, the flat portion is provided on the outer peripheral side, or on both the inner and outer peripheral sides. Is also good. Further, in each of the embodiments, the pillar portion of the retainer has the same thickness as the ring portion, but the pillar portion may have a thickness different from that of the ring portion according to the necessity such as rigidity of the retainer.

The cage of the present invention can be applied to a double row cylindrical roller bearing having three or more ring portions.

[0021]

As described above, in the cage for cylindrical roller bearings of the present invention, the guide surface of the cylindrical roller is formed by an arc surface, and the guide surface of each arc surface is parallel to the side into which the cylindrical roller is press-fitted. By connecting a flat part whose interval is slightly smaller than the diameter of the cylindrical roller, the outer peripheral surface of the cylindrical roller is pressed evenly on this flat part, so that the surface of the cylindrical roller is maintained without damage. Can be press-fitted into a vessel. Further, after the cylindrical roller is pressed into the retainer, the flat portion and the outer peripheral surface of the cylindrical roller form a wedge shape uniformly in the axial direction of the cylindrical roller. Can be supplied well.

[Brief description of the drawings]

FIG. 1A is a partial cross-sectional front view of a cage for a cylindrical roller bearing according to a first embodiment, and FIG.

FIG. 2A is an enlarged cross-sectional view of a main part of FIG. 1A, and FIG. 2B is a cross-sectional view taken along line II-II of FIG.

FIG. 3 is an enlarged sectional view of a main part of the second embodiment.

FIG. 4A is an enlarged cross-sectional view of a main part of a conventional roller bearing cage, and FIG. 4B is a cross-sectional view taken along line IV-IV of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ring part 2 Column part 3 Pocket 4 Cylindrical roller 5 Curved surface part 6 Arc surface 7 Flat part 8 Inner peripheral surface 9 Outer peripheral surface 10 Column part 11 Arc surface 12 Planar part 13 Inner peripheral surface 14 Chamfer 15 Side ring 16 Web 17 Guide Surface 18 Roller 19, 20 Holding projection

Claims (2)

[Claims] 1. A plurality of concentric ring portions and a plurality of column portions which are connected to each other and arranged at equal intervals in a circumferential direction, and accommodate cylindrical rollers between adjacent column portions. In the cylindrical roller bearing retainer, an arc surface for guiding the cylindrical roller is formed on a side surface of each of the column portions, and each of these arc surfaces is at least one of the radial directions of the retainer and the outer peripheral surface of the column portion. Alternatively, the flat portions are connected to the inner peripheral surface and the flat portions, and the flat portions on the side surfaces of the column portions facing each other are parallel to each other, and the interval is formed to be slightly smaller than the diameter of the cylindrical roller. Roller cage for cylindrical roller bearings. 2. The cylindrical roller bearing retainer according to claim 1, wherein a chamfer is provided at a boundary between each of the flat portions and an outer peripheral surface or an inner peripheral surface of the column portion.